The age of big gun and torpedo
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From the late 19th century through World War I, the greatest driving force in warship development was the rivalry between the big gun and the torpedo. Improvements in these weapons had immense influence on the design and use of surface warships, from the huge dreadnought battleships to the small torpedo boat.
Armament
Guns
By 1900 a major change had occurred in the handling of the very heavy main guns, those of 11 to 13.5 inches calibre that fired shells weighing up to 1,300 pounds. In the 1890s such weapons often fired no faster than once every five minutes, compared to the five to 10 rounds per minute fired by a six-inch gun. As power control became easier and more precise, the big guns became more effective. By 1900 it was possible for a 12-inch gun to fire one or two aimed shots per minute.
Meanwhile, the standard of heavy-gun marksmanship began to improve. Although rifled guns had grown bigger and muzzle velocity had increased throughout the late 19th century, there had been no corresponding improvement in fire control. For this reason, effective battle ranges had not extended much beyond 3,000 to 4,000 yards. Then it was discovered that a ship’s roll and pitch could be systematically compensated for, so that each shot could be fired at the same angle to the sea and reach almost exactly the same range. Greater accuracy could be achieved by firing groups of shells, or salvos, bunched around the estimated range. The pattern of splashes raised by a salvo would then make corrections possible. By the end of World War I, fire control had improved enough that guns firing 15,000 to 20,000 yards could attain a hit rate of 5 percent. This meant that a ship firing 10 heavy guns at the rate of once or twice per minute could expect a hit after two or three minutes.
Increased range was valuable for two reasons. First, a ship that could hit at ranges beyond the capabilities of its enemies could stand off and destroy them at leisure. Second, improved gun range increased protection against the new, longer-range torpedoes.
Torpedoes
Modifications and adaptations of the original Whitehead design quickly made the torpedo a formidable weapon. Directional control was greatly improved in the 1890s by the use of a gyroscope to control the steering rudders. Another significant improvement was the use of heat engines for propulsion. British firms, introducing both heat engines and contrarotating propellers, advanced to the high-performance, steam-driven Mark IV torpedo of 1917. Concurrently with this development, an American firm, E.W. Bliss Company, successfully used a turbine to drive a modified Whitehead design. (This Bliss-Leavitt torpedo remained in extensive use until World War II.) By 1914, torpedoes were usually 18 or 21 inches in diameter and could reach almost 4,000 yards at 45 knots or 10,000 yards at close to 30 knots.
Armour
The torpedo threat forced ship designers to provide battleships with underwater protection. Schemes to place coal bunkers near the outside of the ship proved impractical, but research during World War I showed that the basic idea of keeping the underwater explosion at a distance from the interior of the ship was correct. In the Royal Navy, existing ships were fitted with external bulges or “blisters” to keep the explosion farther outboard, and new ships were built with specially designed layers of compartments designed to absorb the shock of explosion.
During the war it also became apparent that the longer firing ranges meant that more shells would fall onto a ship’s deck than on its side armour. Because these ranges were experienced at the Battle of Jutland, ships designed afterward with stronger deck armour were called post-Jutland.
Propulsion
Steam turbines
While weapons were the main driving force in warship development, changes in propulsion were also important. In 1890, propulsion was exclusively by reciprocating (i.e., piston) steam engines, which were limited in power and tended to vibrate. To escape these limits, warship designers adopted steam turbines, which ran more smoothly and had no inherent limits. Turbines were applied to destroyers from about 1900 and to battleships from 1906.
The main drawback of turbine propulsion was that really efficient turbines ran too fast to drive efficient propellers. The solution was to reduce turbine speeds to acceptable propeller speeds through gearing. By 1918, single-reduction gearing was commonplace. Late in the interwar period, the U.S. Navy adopted double-reduction gearing, which permitted even higher turbine speeds without requiring propellers to run any faster.
Fuel
Fuel also became a major issue. Coal was relatively inexpensive and easily available; however, it did not burn cleanly and was difficult to transfer from ship to ship at sea. Oil, on the other hand, burned cleanly, and it could be transferred easily at sea. Also, it had a higher thermal content than coal, so that the same weight or volume of oil could drive a ship much farther. The United States shifted to oil fuel in new ships in about 1910 and converted its remaining coal-burning warships after World War I. Beginning with the Queen Elizabeth class of battleships in 1915–16, Britain switched to oil. The other navies followed suit after the war.
Internal combustion
In contrast to the steam engine, a gasoline or diesel engine often needed no tending at all, could be very compact, and could start and stop quite easily. Such engines made it possible to build small, fast coastal minesweepers, subchasers, and motor torpedo boats. Internal combustion was thought to be especially suitable to subchasers, which would have to stop their engines while listening for a submarine and then start them up suddenly when something was heard.